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<h3>QTopoShot - Drawing command buttons</h3>

The command buttons are grayed out when they are not active.
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<td><img src="../images/buttons/filesave2.png"></td>
<td><img src="../images/buttons/filesaveoff2.png"></td>
<td><b>Save</b></td>
<td>Write the drawing to a Therion th2 file.</td>
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<td><img src="../images/buttons/fileimage.png"></td>
<td>&nbsp;</td>
<td><b>Sketch</b></td>
<td>Load a <a href="qtback.htm">background</a> cave sketch.</td>
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<td><img src="../images/buttons/filegrid.png"></td>
<td>&nbsp;</td>
<td><b>Grid</b></td>
<td>Toggle the display of the underlying grid on and off.<br>
<font size=-1><i>When the grid is displayed the grid spacing in shown in the toolbar.<br>
A scalebar appears in the upper-left side of the canvas,
when the grid is off.
</i></font></td>
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<td><img src="../images/buttons/filecollapse2.png"></td>
<td>&nbsp;</td>
<td><b>Splay toggle</b></td>
<td>Toggle the display of splay shots on/off in the plot.<br>
<font size=-1><i>Centerline shots are red.<br>
Splay shots are black.</i></font></td>
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<td><img src="../images/buttons/filenumber.png"></td>
<td>&nbsp;</td>
<td><b>Station toggle</b></td>
<td>Toggle the display of the stations on/off in the plot.<br>
<font size=-1><i>Station points can be selected only when the stations are displayed.
</i></font></td>
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<td><img src="../images/buttons/filezoomin.png"></td>
<td>&nbsp;</td>
<td><b>Zoom in</b></td>
<td>Zoom in.</td>
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<td><img src="../images/buttons/filezoomout.png"></td>
<td>&nbsp;</td>
<td><b>Zoom out</b></td>
<td>Zoom out.</td>
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<td><img src="../images/buttons/filenew2.png"></td>
<td><img src="../images/buttons/filenewoff2.png"></td>
<td><b>Clear</b></td>
<td>Clear the drawing.<br>
<font size=-1><i>NOTE. This clears all the therion items
you have drawn so far. Be careful with this.</i></font></td>
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<td><img src="../images/buttons/fileundo2.png"></td>
<td><img src="../images/buttons/fileundooff2.png"></td>
<td><b>Undo</b></td>
<td>Undo the last action.<br>
<font size=-1><i>There is no "redo".</i></font></td>
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<td><img src="../images/buttons/filemode1.png"><br>
<img src="../images/buttons/filemode3.png"><br>
<img src="../images/buttons/filemode2.png"></td>
<td>&nbsp;</td>
<td><b>Mode</b></td>
<td>Switch operating mode.<br>
<font size=-1><i>Modes are: "Select", "Point", and "Line".<br>
The icon on this button changes according to the current mode.<br>
Station points are input in "Select" mode. Other points are input in "Point" mode.<br>
Lines are drawn in "Line" mode.</i></font></td>
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<td><img src="../images/buttons/fileclose.png"></td>
<td>&nbsp;</td>
<td><b>Close</b></td>
<td>Close the drawing window.<br>
<font size=-1><i>The drawing is not lost.
It reappears when you reopen the drawing window.</i></font></td>
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